Also, the sub does receive a signal from the reciever. You're correct. All the latest Acoustimass packages use a powered subwoofer so there is a LFE connection. The "Series I" systems routed all 5 channels through the sub because they had a passive crossover that sent the low frequencies to the subwoofer since it wasn't powered. Since the Series III subwoofer is powered I wasn't sure why they still route all 5 channels through the sub until I read the manual online. CAUTION: The Acoustimass® 6 and Acoustimass 10 speaker systems incorporate an automatic protection circuit, which guards against most kinds of damage from electrical stress or overload. This circuit activates at high volume levels to reduce output, causing a slight decrease in volume. This is normal operation and indicates that power input may be exceeding safe levels. Sustained listening at these levels is not recommended. This is how the manual suggested to set up your receiver as well: Your Acoustimass 6 or Acoustimass 10 speakers are compatible with the output from digitalsurround receivers. Integrated Signal Processing assures full bass reproduction for all channels regardless of receiver settings. However, the following table suggests a set of recommended receiver settings. The cube speaker arrays should be set to LARGE in the receiver's digital display menu. The LFE, or subwoofer, is set to ON. If applicable, the crossover value should be set to the lowest number possible, typically 80 Hz.
